Trying to set up Firefox to run as limited user in admin account using DropMyRights (Firefox 3, Windows XP Pro, SP3). I had it working fine for a while, then it starting failing. Firefox process starts and immediately exits when run under DropMyRights. Works fine when I go back to the standard shortcut launch. Anyone with DropMyRights experience, what should I try to figure out what the problem is??

Perhaps that's what changed with your usage of DropMyRights, are you now dropping it too low? Firefox does not react well to being a limited user - and the concensus is that it never will support "Protected Mode", like Chrome and IE do.

Older Answer

i've not used DropMyRights on FireFox, but...

i did see a case where the FireFox shortcut was triggering an elevation (UAC) prompt; whereas running the executable itself would not trigger an elevation prompt. Somehow the shortcut was marked as require administrator - which is not possible through any UI in Windows.

Deleting and recreating the shortcut fixed it, and the user no longer has to elevate to run FireFox when running from a shortcut.

That's because some installer-generated shortcuts are special shortcuts that work through MSI which is why they sometimes show "Please wait, configuring xyz". When you recreate your shortcut it directly executes the Application EXE.
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JarvisMay 30 '09 at 7:15

The shortcut pointed to Firefox.exe directly. Does that make sense?
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Ian BoydJun 2 '09 at 14:44